On the problem of time in two and four dimensions

Details On the problem of time in two and four dimensions On the problem of time in two and four dimensions

2005-09-05

arxiv.org/abs/hep-th/0509039v1

Physics

High Energy Physics

High Energy Physics - Theory

9 pages

Scientific paper

In general-covariant theories the Hamiltonian is a constraint, and hence there is no time evolution; this is the problem of time. In the subcritical free string, the Hamiltonian ceases to be a constraint after quantization due to conformal anomalies, and time evolution becomes non-trivial and unitary. It is argued that the problem of time in four dimensions can be resolved by a similar mechanism. This forces us to challenge some widespread beliefs, such as the idea that every gauge symmetry is a redundancy of the description.

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